#template_url ⇒ String

Location of file containing the template body. The URL must point to
a template (max size: 460,800 bytes) that is located in an Amazon S3
bucket. For more information, go to Template Anatomy in the AWS
CloudFormation User Guide.

Conditional: You must pass TemplateURL or TemplateBody. If both
are passed, only TemplateBody is used.